3-(6,7-Dimethoxyquinazolin-4-yloxy)-4-fluoroaniline → 1-(3-(6,7-Dimethoxyquinazolin-4-yloxy)-4-fluorophenyl)-3-(5-(1,1,1-trifluoro-2-methylpropan-2-yl)isoxazol-3-yl)urea

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Reaction Steps

To a stirred solution of 3-(6,7-dimethoxyquinazolin-4-yloxy)-4-fluoroaniline from the previous step (150 mg, 0.476 mmol) and phenyl 5-(1,1,1-trifluoro-2-methylpropan-2-yl)isoxazol-3-ylcarbamate described in Example 260A (179 mg, 0.571 mmol) in anhydrous THF (5 mL), was added 4-(dimethylamino)pyridine (6 mg, 0.0492 mmol) and the mixture was stirred at rt for 15 h. Concentration in vacuo followed by purification via silica gel column chromatography (eluted with a gradient of 20% ethyl acetate in hexanes to 100% ethyl acetate), afforded 1-(3-(6,7-dimethoxyquinazolin-4-yloxy)-4-fluorophenyl)-3-(5-(1,1,1-trifluoro-2-methylpropan-2-yl)isoxazol-3-yl)urea (35 mg, 14%) as a colorless solid. 1H NMR (300 MHz, DMSO-d6) δ 9.79 (brs, 1H), 9.01 (s, 1H), 8.58 (s, 1H), 7.70 (m, 1H), 7.58 (s, 1H), 7.30-7.42 (m, 3H), 6.86 (s, 1H), 4.00 (s, 6H), 1.54 (s, 6H); LC-MS (ESI) m/z 536 (M+H)+.

Provenance & Evidence